Fix tslint issues

1 files changed, 1 insertions, 1 deletions

diff --git a/packages/order-watcher/src/utils/assert.ts b/packages/order-watcher/src/utils/assert.ts
index 9c992d9b4..4a1441474 100644
--- a/packages/order-watcher/src/utils/assert.ts
+++ b/packages/order-watcher/src/utils/assert.ts
@@ -12,6 +12,6 @@ export const assert = {
     ...sharedAssert,
     isValidSignature(orderHash: string, ecSignature: ECSignature, signerAddress: string): void {
         const isValid = isValidSignature(orderHash, ecSignature, signerAddress);
-        this.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
+        assert.assert(isValid, `Expected order with hash '${orderHash}' to have a valid signature`);
     },
 };